As Scott mentions, posting to forum with mandatory subscribe or requiring some kind of rss practice will get the "news" out, but planting Easter eggs (this has a bit of a special meaning in IT) or implementing the same thing via a scavenger hunt will teach your students academic discipline that will have many future returns. There is a great deal published regarding effective reinforcement schemes, but let me know if you need further assistance in that regard.
Teaching with Moodle
How to automatically inform students about new content?
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